copy$

Keeps only the selected region.

array.slice$(x, [i], [I]);
// x: an array
// i: start index (0)
// I: end index   (x.length)
// --> x

const array = require('extra-array');

var a = [1, 2, 3, 4, 5];
array.slice$(a, 2);
// [3, 4, 5]

a;
// [3, 4, 5]

var b = [1, 2, 3, 4, 5];
array.slice$(b, 2, 4);
// [3, 4]

b;
// [3, 4]

references

• Array.prototype.slice(): MDN web docs